msarossy wrote:

> I would like to connect to a FB2.1 database and run an aggregate query
> which returns mean and standard deviation. Is it possible to write a
> UDF which can take part in such a query. If so, what is passed to the
> UDF which would need an array of unspecified size
>
> the query would be something like
>
> select avg(uv), stdev(uv) from results where step = 1 ;
>
> where stdev is the udf
>
> marc
>

Look for a message from 12/29/2008 from Richard Wesley, subject "Re:
[firebird-support] Standard Deviation"

see you !

--
Alexandre Benson Smith
Development
THOR Software e Comercial Ltda
Santo Andre - Sao Paulo - Brazil
www.thorsoftware.com.br